Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3fc92825e38e51…

MALICIOUS

PDF

77.5 KB Created: 2021-04-05 09:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68dd808498bfe8f21cf74091cceb86dd SHA-1: 1e55804804d88177c87a2970f86d4da7ccd86177 SHA-256: 5b3fc92825e38e518cfc2d7a91cca23125f919dda87f4709c78e884d7d9ece82
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file that contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, https://xezojetit.ru/aws?utm_term=shark+navigator+deluxe+upright+vacuum+reviews, is directly embedded in the document. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous external links suggests a malicious intent, possibly for SEO abuse or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/aws?utm_term=shark+navigator+deluxe+upright+vacuum+reviews
    • https://cdn-cms.f-static.net/uploads/4417406/normal_5fd2fac1354f5.pdf
    • https://nafugawiwira.weebly.com/uploads/1/3/1/4/131438392/0ccf3aba6834.pdf
    • http://lesegot.iblogger.org/40191887746.pdf
    • https://cdn-cms.f-static.net/uploads/4367911/normal_6064627c02576.pdf
    • http://pajelonagij.iblogger.org/59654346109.pdf
    • https://cdn-cms.f-static.net/uploads/4366366/normal_6012245d527d0.pdf
    • https://static.s123-cdn-static.com/uploads/4490739/normal_6000bfd36d9ce.pdf
    • https://cdn-cms.f-static.net/uploads/4379471/normal_601bb39249cbc.pdf
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/pokuvixifuluruxune.pdf
    • https://cdn-cms.f-static.net/uploads/4390057/normal_603fddbb421fe.pdf
    • https://rilinozeni.weebly.com/uploads/1/3/1/0/131070652/d3ab7183391f.pdf
    • https://cdn-cms.f-static.net/uploads/4408471/normal_603a5e990772a.pdf
    • http://roxebil.22web.org/pajukalomixikunazewixeko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_62251b992a0945d6bd36fdbc12a657b7.pdf?index=true
    • http://vixasipa.rf.gd/human_psychology_books_free_download_in_tamil.pdf
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_207746b576b34d3fa67c02a4fa72751a.pdf?index=true
    • http://pepagulax.epizy.com/tetulosi.pdf
    • http://makitononudovo.epizy.com/87346975379.pdf
    • http://fanurumuge.epizy.com/kambal_katinig_worksheet_for_grade_3.pdf
    • http://lexojowal.epizy.com/indices_worksheet_ks3_tes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8d.bin
fc2cd6fc955c7777c8f0bca480942c2fa5cbc63c7dde2657e70df9833189469e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 5876 bytes
font_01_sfnt_off0001037c.bin
5cc2d9113e1147aedcdf55f2cbede86ad4745851ce3cc1b1175df5dc9f479afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 11032 bytes

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